Sunscreen: How to use it

Julie Deardorff, Chicago Tribune

HOW TO USE IT

— Use enough sunscreen to fill a shot glass, advises the American Academy of Dermatology, though larger people should adjust accordingly. Most people apply a quarter to half of the recommended amount of sunscreen, which lowers the advertised SPF factor.

— Spread it on liberally 15 to 30 minutes before going outside and reapply every two hours or after swimming, sweating or towel drying.

— Get some vitamin D. The body needs sunlight to make this vital chemical. The National Institutes of Health suggests five to 30 minutes of sun exposure between 10 a.m. and 3 p.m. several times a week on the face, arms, legs and back during the warmer months. After that, seek shade, cover up, wear a hat and sunglasses and use sunscreen. Speaking of covering up, the FDA doesn't regulate clothing that claims to offer UV protection.